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Thread: Powdery mildew

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  1. #1
    Real Name
    My Grow Area
    Outside 24/7
    Join Date
    Jul 2015
    Miami, Florida

    Default Powdery mildew

    This oncidium was “forgotten” in a shady area under a tree, where it gets watered regularly. I looked at it yesterday and saw all this powdery mildewy stuff all over the roots and basket. We’ve had a lot of rain here over the last week or so that probably hasn’t helped. Other than being a little waterlogged, the roots, leaves and the plant in general is (or seems to be) healthy. How can I get rid of the white stuff?

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  2. #2
    Real Name
    Ray Barkalow
    My Grow Area
    Join Date
    Oct 2012
    Oak Island NC


    You basically have two alternatives - chemical or biologic treatments.

    For the "chemical" way, you have two options; disinfectants or fungicides. Physan 20 is a great disinfectant, but Biosafe Systems Disease Control has less phytotoxicity. Cleary's 3336WP (generic: thiomyl) is likely the most effective fungicide. Copper-based treatments like Phyton 27 may work, but can be damaging to some plants.

    For biological controls, Concentric Ag (formerly Inocucor) Garden Solution is the most broad-spectrum, curing and preventing diseases while boosting the plant's health in general, with other biological brands (EM-1, Quantum Orchid) being much narrower-scope treatments.

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